Pulling-machine



l. H. SCHOTT.

PULLING MACHINE.

APPLIcAloN FILED MAY29,1919.

Patented Jan. 6,1920. 2 SHETS-SHEETI 34a/uw: hoz

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l s* l" r 5+ a I l f El' #I l I' u l J. H. SCHOTT.

PULLING MACHINE. APPucATloN FILED MAY 29. 1919.

Patented Jan. 6, 1920.

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l wor/Mga UNITED STATES PATENT OFFICE.

JOHN H. SCHOTT, OF BOULDER, COLORADO, AS'SIGNOR OF ONE-FIFTH TO JAMES G.

ARCHIBALD, ONE-FIFTH TO J. EMMNS DE KALB, AND ONE-FIFTH TO MICHAEL M.RINN, ALL OF BOULDER, COLORADO.

PULLINGMACHINE.

Application led May 29, 1919.

To all whom t may concern:

Be it known that I, .Ici-1N H. SCHOTT, a citizen of the United States,residing at Boulder, in the county of Boulder and State of Colorado,have invented certain new and useful Improvements in Pulling-Machines;and I do declare the following to be a full, clear,'and exactdescription of the invention, such as will enable others skilled intheart to which it appertains to make and use the same.

This invention relates to improvements in pulling machines, particularlyto that type adapted for use in wire stretching, and has for its primaryobject the provision of a compact, simply constructed device, onerequiring a minimum amount of power to op crate, yet being highlyefficient in performing its functions. j

Another object is to provide a device of this character including` anovel means for positively engaging the wire gripping elements with thewire being stretched, there by preventing accidental slipping ordisengagement from the machine, of the' wires.

With these and numerous other objects in view my invention resides inthe novel features of co-nstruction and arrangement of parts as will beset forth in the specification and claims and clearly illustrated intheaccompanying drawings which form a part of this application and inwhich,

Figures l and Qare side elevations of the device in use, showing theymovable wire grippers in different positions; j

Fig. 3 is a top plan view of-Fig. l;

Fig. Ll is a horizontal sectional view taken on the line 1 l of Fig. l;

'Fig..5 is a vertical longitudinal sectional view taken on the line 5 5of Fig. t.

Fig. 6 is a vertical transverse sectional viewrtaken on the line 6-6 ofFig. l and;

Fig. 7 is a detail vertical sectional Vview of one of the gi'ippers andslides taken on the lineZ-r? of Fig. 6. Y

In these drawings which constitute a part of the application and inwhich similar reference characters designate 4corresponding partsthroughout the several views, the numeral l indicates broadly asubstantially Vrectangular casing which is divided into vtwocompartments by a vertical longitudi-n nally extending partition 2, saidpartition Specification of Letters Patent.

Patented J an. 6, 1920.

serial No. 300,6o2.

be hereinafter set forth, said casing having one side closed by aremovable plate 3, and its other side partially closed by narrow stripst secured to the upperfand lower edges.

Covering the remaining openY space between the strips 4, is a bach plate5 which is removably secured to the end portions of the casing, saidplate being provided with a pairv of parallel laterally projectingflanges 6, preferably though not necessarily, formed integral with theplate, these flanges and the black plate forming a guide 10 adapted toreceive a pair of movable slides or pullers 7. The back plate 5 isprovided near each end with a longitudinally extendingslot 8 openinginto the casing. The upper flange is provided with longitudinal slots 9at points near each end, said slots being adapted to guide the movablepins or screws which are secured in the upper edges of the slides orpullers at points approximately midway their lengths. y Y

Extending laterally from the lower end of the slide or vpullers 7 andpreferably though notk necessarily formed integral therewith, are fixedjaw members 11, lprovided with gripping teeth on .theirV upper faces,said teeth being adapted to coact with the teeth on the lower edgesv ofyieldable jaw members l2 which are mounted on outwardly projecting lugsor studs l'formed on the slides 7,v said jaws forminggrippers to holdthe vwire being stretched. Vertically balined withY the slots intheupper flange 6 and of similar dimensions arc slots 14 in the lowerflange adapted to guide the movable pins or screws which are secured inthe lower smooth face of the fixed jaws 11, said pins or screws in thelower and upper flanges being adapted to retain the slides lor puller'sin proper relative position with the guide l0. l K, 'A

The movement of the yieldable jaws 12 is controlled by coil springs V15f disposed around the studs 13,7one end ofeach spring slides or pullers7.

Mounted in the parallel openings in the partition 2 of the casing, arethree shafts, the endmost shafts 17, at their ends adjacent the backplate of the guide 10, loosely carrying the gear wheels 18 which areprovided with crank pins 19 adapted to be connected to the stud 16 ofthe slides or pullers by a link 20.

Keyed to the central shaft 21, at the end adjacent the loosely mountedgear wheels 18 is a small gear 2,2 whose teeth mesh with those of theother gears 18. A gear wheel 23 of approximately the same dimensions asthe large gears 18, is keyed to the central shaft on the opposite sideof the partition. A small gear wheel 24 is keyed to one of the endmostshafts, its teeth meshing with those of the large gear 23.

The shafts extend through openings in the cover plate 3, said openingsforming bearings for the shafts. The endmost shaft which carries thesmall gear 24 is slightly longer than the remaining two, for the purposeof receiving an operating crank 25 keyed thereto.

For a purpose to be fully described, a pair of longitudinally adjustablestops 26 are mounted on the upper flange of the guide 10, said stopsbeing illustrated in the drawings as small blocks 27 disposed on theunder side of said flange, having upstanding threaded studs projectingthrough longitudinally extending slots in said flange and receiving nutsthereon. These stops may be in the form of leaf springs disposed inslots in the flange and extending a short distance below said flange.

In operation, the machine is first hitched to a post, by means of asuitable chain, one end of which is secured to an eye 28 on one end ofthe casing 1. The wire to be stretched, is then placed between the fixedand yieldable or movable jaws on the slides `or pullers, separation ofsaid jaws being made possible by the handles 29 which are suitablysecured to the movable jaws and extend vertically upward. The handlesare released upon placing the wire between said jaws and the next stepis merely to turn the crank.

As will be readily seen, turning the crank operates the gears andsimultaneously moves the slides or pullers 7 in opposite directions.lVhen t-he slides are at their innermost positions Vand about to moveoutwardly, the jaws near the end of the casing adjacent the post, gripthe wire and tighten it, while the other jaws are sliding over saidwire, in

the opposite direction, for the purpose of.

getting a new grip on it. In order to assure a firm hold on the wire theaforementioned stops 26 are positioned in the path of travel of thegrippers striking lugs 30 on the movable jaws, so that just prior to thebeginning of the working strokes the yieldable jaws are forced againstthe wire, getting a firm grip thereon.

In the drawings, certain specific details of construction have beenshown for accomplishing probably the best results, and in the preceding,such details have been described, but it is obvious that I need not berestricted thereto otherwise than to the extent claimed.

I claim- 1. A machine of the class described comprising a box-likecasing, a guide on said casing having slots, a pair of slides carried bysaid guide, a pair of yieldable gripping devices on said, slides, a pairof studs on said slides movable in said slots of said guide, aypartition in said casing, parallel shafts mounted in said partition,gear wheels mounted on certain of said shafts on the side of thepartition adjacent the guide, crank pins on said wheels, linksconnecting said crank pins and studs and means on the opposite side ofthe partition for rotating said gear wheels whereby the slides will besimultaneously moved in opposite directions.

2. A machine of the class described com prising a box-like casing, aguide on said casing having slots, a pair of slides carried by saidguide, a pairof yieldable gripping devices on said slides, a pair ofstuds on said slides movable in said slots of said guide, a partition insaid casing, parallel shafts mounted in said partition, a handle on oneof the endmost shafts on one side of the partition, a pair of gearwheels mounted on the central shaft and aforesaid endmost shaft, a pairof gear wheels on the endmost shafts on the opposite side of thepartition, crank pins on said wheels, links connecting said crank pinsand studs and an intermediate gear mounted on the central shaft andadapted to transmit power to the last named gear wheels whereby theslides will be simultaneously moved in opposite directions.V

3. A machine of the class described including a guide, a wire pullerslidable in said guide, means for manually moving the puller, ayie-ldable wire gripper mounted on said puller, means for operating saidpuller and means on said guide in the path of travel of said gripper forforcing the same into firm engagement with the wire being stretched.

li. A machine of the class described including a guide, a wire pullerslidable in travel of the gripper for forcing the same into firmengagement With the Wire being stretched.

5. A machine of the class described including a guide, a pair of slidesin said guide, said slides being substantially L- shaped in crosssection, gripping teeth on the upper faces of the horizontal flanges ofsaid slides, a pair of substantially cam shaped jaws pivotally mountedon the slides and having teeth for coperation with the other teeth togrip a wire to be stretched,

stops on said guide in the path of travel of the jaws and lugs on thejaws to engage said stops at the beginning of each working strokewhereby the pressure of the aws on the wire is increased to hold saidwire.

6. A machine of the class described comprising a box-like casing, aguide on said casing having slots, a pair of slides carried by saidguide, a pair of yieldable gripping devices on said slides, a pair ofstuds on said slides movable in the slots of said guide, gearing in lthecasing for simultaneously moving the slides in opposite directions, andcoa-cting parts on'sa-id guide and gripping devices to force thegripping devices into firm engagement with the wire at the end of eachworking stroke.

7. A machine of the class described including a guide, a pair of slidesin said guide, means for simultaneously moving the slides in oppositedirections, wire gripping cams mounted on said slides, spaced stops onsaid guide, and means on the cams for engagement With said stops at thebeginning of each working stroke to force the cams into firm engagementwith the wire being stretched.

In testimony whereof I have hereunto set m hand.

y JOHN H. SCHOTT.

